Their equipment is extremely relevant to the outcome. A broadsword is at a severe disadvantage against Gannicus' dual swords and light armor; as well, his full armor (with no helmet to boot) would only serve to slow him down while protecting areas that are not of vital importance in 1 on 1 combat
Unless Lancelot has some impressive borderline superhuman speed/strength feats (which Gannicus would have as well) he'll have his neck cut in a few strokes I'm afraid
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